How does a earthquake occur

plz help need it for a experiment
Anonymous User
Anonymous User
Asked Mar 16, 2011
The sub-surface of the earth is made up of large contiguous areas called tectonic plates. They very slowly expand or contract until enough pressure builds up at their edges to cause the plates to suddenly shift. The vibration and movement from the shift is what we call an earthquake.
Rob
Answered Mar 16, 2011
Edited Mar 16, 2011
do you know everything?
Abrii Mar 16, 2011
I get all of my information from the parrot. :-)
Rob Mar 16, 2011
You are really funny Rob, just my type of humor.
ok I know thats right

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